package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class shoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    DishMapper dishMapper;
    @Autowired
    SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addCart(ShoppingCartDTO shoppingCartDTO) {
        //创建购物车
        ShoppingCart shoppingCart = new ShoppingCart();
        //赋值
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置用户id
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);
        //判断是否存在
        if (shoppingCarts!=null && shoppingCarts.size()>0){
            //商品存在，数量+1，执行update操作
            shoppingCart = shoppingCarts.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //商品不存在,插入购物车表中
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId!=null){
                //插入的是菜品，设置dish_id
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //插入的是套餐，设置setmeal_id
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);
        return shoppingCarts;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车中的商品
     * @param shoppingCartDTO
     */
    @Override
    public void delete(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //查询要删除的商品数量
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);
        shoppingCart= shoppingCarts.get(0);
        if (shoppingCart.getNumber()>1){
            shoppingCart.setNumber(shoppingCart.getNumber()-1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            shoppingCartMapper.delete(shoppingCart);
        }
    }
}